CVE-2026-73046

SiYuan before v3.7.4 improperly restricts excessive authentication attempts in the CheckAuth() middleware. The HTTP Basic Authentication branch, which guards nearly the entire /api/* surface, accepts the workspace access code (Conf.AccessAuthCode) as the Basic Auth password but never consults the CAPTCHA/lockout gate or increments the failure counter used by the cookie/session login path. This allows unauthenticated remote attackers to brute-force the admin access code with unlimited automated requests and obtain full RoleAdministrator access to the kernel. A secondary weakness exists because the access code is compared using a non-constant-time string comparison.

• CWE-307

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-w3xh-mmmh-r54v
• https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-http-basic-auth
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-w3xh-mmmh-r54v

Published

Aug 15, 2026

Last Modified

Aug 26, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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